JP2005188766A - Refrigerating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerating apparatus capable of easily preventing freezing of supplied cold water while preventing the danger of overturning when transported or installed. <P>SOLUTION: A refrigerant/water heat exchanger for producing cold water is divided in a plurality of refrigerant/water heat exchangers 20a, 20b which are plate-type heat exchangers, and a refrigerant inlet/outlet and a cold and hot water inlet/outlet are disposed to face each other in positions near the edge parts 40c, 40d in the heat exchanger unit 2. A refrigerant heat exchanger 20c and a receiver tank 22 are disposed near the respective inlets/outlets. A heavy load can thereby be disposed equally dispersed within the heat exchanger unit 2, and the center-of-gravity position of the heat exchanger unit 2 can be made a low position almost at the center of the heat exchanger unit 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a refrigeration apparatus configured by connecting a heat source unit and a heat exchange unit.

Conventional refrigeration systems are equipped with a heat source unit equipped with a compressor that compresses and discharges refrigerant, and a refrigerant / water heat exchanger that exchanges heat between the refrigerant and water supplied from the heat source unit. A refrigeration apparatus configured by connecting a heat exchange unit that is generated and supplied to a use-side heat exchanger is known (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 08-233405

  However, in the conventional refrigeration system, a plurality of double-pipe refrigerant / water heat exchangers that are formed in a coil shape are provided for the refrigerant / water heat exchanger mounted on the heat exchange unit. Since the double-pipe refrigerant / water heat exchangers are stacked in the vertical direction, the position of the center of gravity becomes high, and there is a risk of falling during transportation or installation.

  In addition, from the viewpoint of flow resistance and heat exchange efficiency, the refrigerant was circulated between the inner tube and the outer tube of the double-pipe heat exchanger, and the cold / hot water was circulated in the inner tube. When cold water is supplied from the heat exchange unit to the use side heat exchanger, the temperature sensor must be inserted into the inner pipe to prevent freezing, and the heat exchanger can be easily processed. It was not a thing.

  Therefore, the present invention has been made to solve such problems, and prevents the risk of falling during transportation and installation and facilitates freezing of cold / hot water supplied to the use-side heat exchanger. The present invention provides a refrigeration apparatus including a heat exchange unit that can be prevented.

  The invention according to claim 1 is a refrigeration configured by connecting a heat source unit that compresses and discharges a refrigerant and a heat exchange unit that exchanges heat with the refrigerant and supplies cold / hot water to a use-side heat exchanger. In the apparatus, a refrigerant / water heat exchanger for exchanging heat between the refrigerant and the cold / hot water is provided as a divided plate heat exchanger in the heat exchange unit and supplied from the heat source unit. A refrigerant heat exchanger for exchanging heat between the refrigerant and the refrigerant returning to the heat source unit, and a receiver tank for temporarily storing the refrigerant circulating in the heat exchange unit are provided, and these refrigerant / water heat exchanger, refrigerant The heat exchanger and the receiver tank are arranged so as to be evenly dispersed in the heat exchange unit.

  The invention according to claim 2 is the invention according to claim 1, wherein the refrigerant / water heat exchanger divided into a plurality of parts is evenly distributed and arranged in the heat exchange unit. The refrigerant heat exchanger is disposed in the vicinity of the refrigerant / water heat exchanger, and the receiver tank is disposed at a position facing the refrigerant heat exchanger with the center of the heat exchange unit as a center. It is a feature.

  According to a third aspect of the present invention, in the first or second aspect, the plurality of refrigerant / water heat exchangers, the refrigerant heat exchanger, and the receiver tank are arranged in the vicinity of an edge in the heat exchange unit. The refrigerant inlet / outlet and the cold / hot water inlet / outlet of each of the heat exchangers of the refrigerant / water heat exchanger and the refrigerant heat exchanger are the refrigerant inlet / outlet and the cold / hot water of another heat exchanger. It is arranged in a direction facing the entrance / exit.

  According to a fourth aspect of the present invention, in the first aspect, the outermost layer in each refrigerant / water heat exchanger is a cold / hot water layer through which the cold / hot water flows, and the refrigerant / water heat exchange is performed. A temperature sensor for detecting the temperature of the cold / hot water flowing out from the refrigerant / water heat exchanger is provided in the vicinity of the cold / hot water outlet of the vessel.

  According to a fifth aspect of the present invention, the temperature sensor according to the fourth aspect of the present invention, wherein the temperature sensor is provided by performing heat insulation treatment with outside air on an outer surface in the vicinity of the cold / hot water outlet of each refrigerant / water heat exchanger. It is characterized by that.

  According to the first aspect of the present invention, the refrigerant / water heat exchanger for exchanging heat between the refrigerant and the cold / hot water is divided into a plurality of plate heat exchangers, and these refrigerant / water heat exchanger, By arranging the exchanger and the receiver tank so as to be substantially evenly distributed in the heat exchange unit, the center of gravity of the heat exchange unit can be brought to a substantially central position of the heat exchange unit, and the center of gravity is The height position of can be lowered.

  According to the second aspect of the present invention, first, an even number of refrigerant / water heat exchangers, which are the heaviest ones, are evenly arranged in the heat exchange unit, and in the vicinity of any one of the refrigerant / water heat exchangers. The refrigerant heat exchanger, which is the next heavy object, is disposed, and a heavy object substantially equivalent to the refrigerant heat exchanger is provided at a position facing the refrigerant heat exchanger with the center of the heat exchange unit as the center. By disposing a certain receiver tank, the center of gravity of the heat exchange unit can be easily set to a substantially central position.

  According to a third aspect of the present invention, the position where the plurality of refrigerant / water heat exchangers, the refrigerant heat exchanger, and the receiver tank are disposed is set near the edge in the heat exchange unit, and the refrigerant / The refrigerant inlet / outlet and the cold / hot water inlet / outlet of each heat exchanger of the water heat exchanger and the refrigerant heat exchanger are arranged in the direction facing the refrigerant inlet / outlet / cold water inlet / outlet of the other heat exchanger, so that the heat exchange Since only the refrigerant pipe connected to the heat exchanger or the like is provided in the central portion in the unit, a space for performing maintenance of the heat exchange unit can be provided in the central portion.

  According to the invention described in claim 4, the outermost layer in each refrigerant / water heat exchanger is a cold / hot water layer through which the cold / hot water flows, to the vicinity of the cold / hot water outlet of the refrigerant / water heat exchanger, By providing a temperature sensor that detects the temperature of the cold / hot water flowing out of the refrigerant / water heat exchanger, it is possible to detect the temperature of the cold / hot water more accurately and prevent the cold / hot water from freezing.

  According to the invention described in claim 5, since the temperature sensor is provided by performing heat insulation treatment with outside air on the outer surface in the vicinity of the cold / hot water outlet of the refrigerant / water heat exchanger, the temperature sensor is attached. However, it can be easily performed, and the temperature of the cold / hot water detected by the temperature sensor is not affected by outside air.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram illustrating a system configuration including a refrigerant circuit of a refrigeration apparatus to which the present invention is applied. The refrigeration apparatus 100 is configured by connecting a heat source unit 1 and a heat exchange unit 2 with refrigerant pipes 3a and 3b.

  The heat source unit 1 performs control of the gas engine 10, the compressor 11 driven by the gas engine 10, and the gas engine 10, communication with a heat exchange side control device 24 of the heat exchange unit 2 described later, and the like. A machine room 12 containing the heat source side control device 16 and the like is provided on a base frame (not shown). Above the machine room 12, an outdoor heat exchanger 13 and air blown to the outdoor heat exchanger 13 are sent. A heat radiating chamber 15 in which the blower fans 14 and 14 to be performed are stored is provided.

  The heat exchange unit 2 includes a plurality of plate-type heat exchangers, ie, refrigerant / water heat exchangers 20a, 20b, a refrigerant heat exchanger 20c, the refrigerant / water heat exchangers 20a, 20b, and the refrigerant heat exchange. The electric expansion valve 21 for controlling the flow rate of the refrigerant flowing through the vessel 20c, the receiver tank 22 for temporarily storing the refrigerant, check valves 23a and 23b, and the electric motor based on temperature signals from various temperature sensors described later. A heat exchange side control device 24 that houses the adjustment of the opening degree of the expansion valve 21 and communication with the heat source side control device 16 of the heat source unit 1 is housed.

  The refrigerant pipe connection in the heat exchange unit 2 will be described. The refrigerant pipe 3a extending from the heat source unit 1 is connected to one end of the receiver tank 22, and the other end of the receiver tank 22 is connected to a check valve. 23a is connected to one first refrigerant inlet 53a (see FIG. 3) of the refrigerant heat exchanger 20c, and the check valve 23a is connected from the receiver tank 22 to the refrigerant heat exchanger 20c. It is provided in the direction in which the refrigerant flows. The other end of the receiver tank 22 is connected to a check valve 23b having one end connected to the first refrigerant outlet 53b (see FIG. 3) of the refrigerant heat exchanger 20c. The check valve 23 b is provided in a direction in which the refrigerant flows from the first refrigerant outlet 53 b of the refrigerant heat exchanger 20 c to the other end of the receiver tank 22. Further, the one first refrigerant outlet 53b of the refrigerant heat exchanger 20c is connected to the refrigerant inlet 34a (see FIG. 2) of the refrigerant / water heat exchanger 20a via the electric expansion valve 21. The refrigerant outlet 34b (see FIG. 2) of the water heat exchanger 20a is connected to the refrigerant inlet of the refrigerant / water heat exchanger 20b. The refrigerant outlet of the refrigerant / water heat exchanger 20b is connected to the other second refrigerant inlet 54a (see FIG. 3) of the refrigerant heat exchanger 20c, and the second refrigerant outlet 54b (see FIG. 3) of the refrigerant heat exchanger 20c. 3) is connected to a refrigerant pipe 3b extending from the heat source unit 1. That is, the refrigerant / water heat exchangers 20a and 20b are provided connected in series on the refrigerant circuit.

  Moreover, although the cold / hot water piping 4a, 4b is extended from the heat exchange unit 2 and connected to the utilization side heat exchanger 30, the cold / hot water outlet 35b of the refrigerant / water heat exchanger 20a (see FIG. 2). The hot / cold water pipe 25a extending from the refrigerant / water heat exchanger 20b is connected to the cold / hot water pipe 25b extending from the cold / hot water outlet of the refrigerant / water heat exchanger 20b. The cold / hot water pipe 26a that is connected to the cold / hot water inlet of the refrigerant / water heat exchanger 20a and that extends from the cold / hot water inlet 35a (see FIG. 2) extends from the cold / hot water inlet of the refrigerant / water heat exchanger 20b. It connects with the water piping 26b, and is connected to one cold / hot water outlet of the utilization side heat exchanger 30 as the said cold / hot water piping 4b. That is, the refrigerant / water heat exchangers 20 a and 20 b are provided in parallel on the cold / hot water circuit connected to the use-side heat exchanger 30.

  Thereby, on the refrigerant circuit side supplied from the heat source unit 1, it is possible to set a long path for heat exchange with the cold / hot water supplied from the heat exchange unit 2 to the use side heat exchanger 30. The efficiency of heat exchange with cold / hot water can be improved, and on the cold / hot water circuit side, refrigerant / water can be supplied without reducing the flow rate of cold / hot water supplied from the heat exchange unit 2 to the use-side heat exchanger 30. The flow rate of the cold / hot water in the heat exchangers 20a, 20b and in each of the cold / hot water pipes connected to the pipe can be reduced, and the corrosion of the pipes and the like by the cold / hot water can be suppressed. Moreover, even if the flow rate of the cold / hot water circulated to the refrigerant / water heat exchangers 20a, 20b is reduced, the flow rate of the cold / hot water supplied from the heat exchange unit 2 to the use-side heat exchanger 30 can be secured. The diameter of each of the cold / hot water pipes 25a, 25b, 26a, and 26b can be reduced and the pipes can be formed using copper pipes, so that the piping process is facilitated and the manufacturing cost can be kept low. .

  The refrigerant pipe near the refrigerant inlet 34a of the refrigerant / water heat exchanger 20a is provided with a refrigerant inlet sensor T1, and the refrigerant pipe 3b near the second refrigerant outlet 54b of the refrigerant / water heat exchanger 20c has a refrigerant. An outlet sensor T2 is provided, and a cold / hot water outlet sensor t2 and cold / hot water pipes 26a and 26b are provided at positions where the cold / hot water pipes 25a and 25b extending from the refrigerant / water heat exchangers 20a and 20b respectively join. A cold / hot water inlet sensor t1 is provided at the joining position, and anti-freezing sensors t3, t4 are provided at the cold / hot water outlets of the respective refrigerant / water heat exchangers 20a, 20b to which the cold / hot water pipes 25a, 25b are connected. (Temperature sensors) are provided, and the temperature signals detected by these temperature sensors are detected by the heat exchange side control device 24.

  Here, the refrigerant / water heat exchanger 20a and the freeze prevention sensor T3 will be described.

  As shown in the development view of FIG. 2, the refrigerant / water heat exchanger 20a has a structure in which a number of partition plates 31c are provided between the tube plates 31a and 31b, and the refrigerant layer 32 through which the refrigerant flows. And the cold / hot water layer 33 through which the cold / hot water flows are stacked alternately.

  For example, a refrigerant inlet 34a and a cold / hot water outlet 35b are provided above the tube plate 31a, and a refrigerant outlet 34b and a cold / hot water inlet 35a are provided below the pipe plate 31a. The thus-received refrigerant flows into the refrigerant layer 32 provided every other, performs heat exchange with the cold / hot water while flowing through the refrigerant layer 32, and flows out from the refrigerant outlet 34b. Similarly, the cold / hot water flowing in from the cold / hot water inlet 35a flows into the cold / hot water layer 33 provided every other, and performs heat exchange with the refrigerant while circulating through the cold / hot water layer 33, It is cooled or heated and flows out from the cold / hot water outlet 35b.

  The refrigerant / water heat exchanger 20a is configured such that the cold / hot water layer 33 is provided on the outermost layers 36a, 36b, and the anti-freezing sensor is disposed near the cold / hot water outlet 35b on the outer surface of the tube plate 31a. t3 is provided. This is in the vicinity of the refrigerant inlet 34a into which the refrigerant supplied from the heat source unit 1 flows when the cold water is supplied from the heat exchange unit 2 to the use side heat exchanger 30, and the cold / hot water temperature near the cold / hot water outlet 35b is Since the temperature is the lowest, the temperature of the chilled water cooled by the heat exchange with the refrigerant is detected at this position, the heat exchange side control device 24 determines that the chilled water is frozen, and transmits it to the heat source side control device 16. This is because by controlling the operation of the gas engine 10 and the compressor 11, it is possible to reliably prevent the cold water from freezing. In addition, it is desirable that the freeze prevention sensor t3 is provided in the outermost layer 36a in the vicinity of the cold / hot water outlet 35b. However, from the viewpoint of difficulty in workability of the refrigerant / water heat exchanger 20a, the freeze prevention sensor t3 is provided Insulation treatment with outside air is performed with a heat insulating material or the like.

  The refrigerant / water heat exchanger 20b and the freeze prevention sensor t4 are the same as the refrigerant / water heat exchanger 20a and the freeze prevention sensor t3, and thus the description thereof is omitted.

  Further, the refrigerant heat exchanger 20c will be described. As shown in FIG. 3, the refrigerant heat exchanger 20c has the same configuration as that of the refrigerant / water heat exchangers 20a and 20b. The refrigerant heat exchanger 20c includes the tube plates 50a and 50b. Between the first refrigerant layer 51 and the refrigerant / water heat exchanger 20a, the first refrigerant layer 51 flows in the refrigerant / water heat exchanger 20a through the check valve 23a. The second refrigerant layer 52 through which the refrigerant that flows out of the water heat exchanger 20b and returns to the heat source unit 1 through the refrigerant pipe 3b flows alternately and repeatedly.

  Above the tube plate 50a, for example, a refrigerant flowing through the check valve 23a from the receiver tank 22 flows into one of the refrigerant heat exchangers 20c, a first refrigerant inlet 53a, and refrigerant / water heat. There is provided a second refrigerant outlet 54b through which heat is exchanged with cold / hot water in the exchanger 20a, the refrigerant flowing through the refrigerant pipe 3b and returning to the heat source unit 1 flows out, and below the check valve from the receiver tank 22 The first refrigerant outlet 53b from which the refrigerant flowing through 23a flows out, and the refrigerant that has flowed out from the refrigerant outlet 34b of the refrigerant / water heat exchanger 20a flow into the other of the refrigerant heat exchanger 20c. 2 refrigerant inlets 54a are provided, and the refrigerant flowing through the check valve 23a and flowing in from the first refrigerant inlets 53a flows into the other first refrigerant layer 51 provided every other refrigerant inlet 54a. Circulate through the refrigerant layer 51 Heat exchange with the refrigerant flowing out from the refrigerant outlet of the refrigerant / water heat exchanger 20b flowing through the other second refrigerant layer 52 in between is supercooled and flows out from the first refrigerant outlet 53b. ing. Similarly, the refrigerant flowing through the refrigerant / water heat exchanger 20b that has flowed in from the second refrigerant inlet 54a flows into the second refrigerant layer 52 that is provided every other refrigerant, and flows through the second refrigerant layer 52. Heat is exchanged with the refrigerant that has passed through the check valve 23a in between, and the refrigerant is overheated and flows out from the second refrigerant outlet 54b.

  Furthermore, the refrigerant and cold / hot water flowing in the refrigerant / water heat exchangers 20a and 20b flow in opposite directions when cold water is supplied from the heat exchange unit 2 to the use-side heat exchanger 30. The flow direction of the refrigerant flowing through the one in the refrigerant heat exchanger 20c and the refrigerant flowing through the other in the refrigerant heat exchanger 20c flow in opposite directions in the same manner. In the case where hot water is supplied from the heat exchange unit 2 to the use-side heat exchanger 30, the refrigerant and the hot water flow in the same direction in the refrigerant / water heat exchangers 20a and 20b. In the vessel 20c, since the refrigerant flowing through the one and the other flows in the opposite direction, the refrigerant 20c flows in the opposite direction as in the case of supplying cold water from the heat exchange unit 2 to the use side heat exchanger 30. Become.

  Next, the structure of the heat exchange unit 2 will be described. As shown in FIG. 4, the heat exchange unit 2 has a base frame 40, and L-shaped members 41 a to 41 h on the base frame 40. The housing base 42 is constructed by combining the above.

  Further, in the vicinity of the opposing edge portions 40a and 40b on the base frame 40, the hot and cold water pipes 43a and 43b constituting a part of the hot and cold water pipes 4a and 4b in FIG. Is arranged. The cold / hot water pipes 43a and 43b are straight pipes whose both ends can be opened, and the cold / hot water pipes 4a are oriented in either the edge 40c side or the 40d side depending on the installation situation. 4b can be extended.

  Further, a refrigerant / water heat exchanger 20a and a refrigerant heat exchanger 20c are provided on the edge 40c side of the base frame 40, and a refrigerant is provided on the edge 40d side facing the edge 40c. / The water heat exchanger 20b, the receiver tank 22, and the heat exchange side control device 24 are placed. In other words, the refrigerant / water heat exchangers 20a and 20b, the refrigerant heat exchanger 20c, the receiver tank 22 and the like, which are heavy objects, are arranged on the base frame 40 so as to be distributed substantially evenly.

  Further, the refrigerant inlet / outlet and the cold / hot water inlet / outlet of the refrigerant / water heat exchanger 20a and the refrigerant heat exchanger 20c are opposed to the refrigerant inlet / outlet of the refrigerant / water heat exchanger 20b. It is arranged.

  As a result, the center of gravity of the heat exchange unit 2 can be set near the center of the base frame 40, and the height of the center of gravity can be lowered, so that the heat exchange unit 2 can be transported or installed. The danger of falling over can be prevented. Moreover, in the center part in the heat exchange unit 2, the refrigerant | coolant piping in which the refrigerant | coolant supplied from the heat source unit 1 circulates, the cold / hot water piping 25a, 25b connected to the said cold / hot water piping 43a, 43b, and cold / hot water piping Since only pipes such as 26a and 26b are provided, this central portion can be used as a maintenance space for the heat exchange unit 2, and the maintainability can be improved. Further, since the heat exchange unit 2 includes the receiver tank 22, even if the refrigerant / water heat exchangers 20a, 20b are plate-type heat exchangers, the refrigerant / water heat exchangers 20a, 20b are circulated. The refrigerant capacity can be secured and, for example, in the case of a failure of the heat source unit 1, the refrigerant in the heat source unit 1 is recovered into the receiver tank 22 to repair the heat source unit 1. Alternatively, operations such as maintenance can be performed.

  Further, as shown in the internal side view of FIG. 5A, a substantially M-shaped angle 44 extending to the body of the receiver tank 22 is formed on the side surface of the heat exchange side control device 24 on the receiver tank 22 side. Is provided. FIG. 5B is an internal top view. This is because the receiver tank 22 has a columnar shape extending in the vertical direction, so that the receiver tank 22 is prevented from fluctuating during transportation and the heat of the receiver tank 22 is controlled by the heat exchange side control device 24. And the purpose as heat transfer means for preventing dew condensation in the heat exchange side control device 24. In the present embodiment, an angle 44 capable of transferring heat is provided between the receiver tank 22 and the heat exchange side control device 24. However, a part of the side surface of the heat exchange side control device 24 is provided as a part of the receiver tank 22. It may be formed and configured to be in surface contact with the outer peripheral surface of the body portion. As a matter of course, since the liquid refrigerant is stored in the receiver tank 22, the temperature of the receiver tank 22 is about 40 ° C. when the refrigeration apparatus 100 is operated. By transmitting the temperature of the receiver tank 22 to the heat exchanging side control device 24, it is possible to prevent condensation in the heat exchanging side control device 24 and, in general, to prevent condensation, the heat exchanging side control device. Since the heat insulating material provided so as to cover the outer wall of 24 can be reduced, the manufacturing cost can be reduced.

  Next, the operation of the refrigeration apparatus 100 will be described with reference to FIG.

  First, in the case of supplying cold water from the heat exchange unit 2 to the use side heat exchanger 30, when an instruction for operation is issued to the heat source unit 1 by a remote controller (not shown), the heat source side control device 16 receives this. The operation of the gas engine 10 is started. When the operation of the gas engine 10 is started, the operation of the compressor 11 is started by the driving force, and the high-temperature and high-pressure gas refrigerant is discharged. The discharged gas refrigerant flows into the outdoor heat exchanger 13, dissipates heat to the outside air by blowing air from the blow fans 14 and 14, and becomes a low-temperature and high-pressure liquid refrigerant, which is supplied from the refrigerant pipe 3a to the heat exchange unit 2. Is done.

  The liquid refrigerant circulates in the direction of arrow X, flows into the receiver tank 22 of the heat exchange unit 2 from the refrigerant pipe 3a, and performs refrigerant / water heat exchange in the refrigerant heat exchanger 20c via the check valve 23a. Heat is exchanged with the high-temperature and low-pressure gas refrigerant flowing through the vessels 20a and 20b, and the refrigerant is supercooled, depressurized by the electric expansion valve 21, and flows into the refrigerant / water heat exchanger 20a.

  In the refrigerant / water heat exchanger 20a, the cold / hot water flowing from the cold / hot water pipe 26a to the refrigerant / water heat exchanger 20a is cooled and evaporated. At this time, substantially half of the refrigerant evaporates and the refrigerant enters a gas-liquid mixed state. Next, the cold / hot water flowing into the refrigerant / water heat exchanger 20b and flowing into the refrigerant / water heat exchanger 20b from the cold / hot water pipe 26b is cooled and evaporated. At this time, most of the refrigerant evaporates, and the liquid refrigerant becomes a high-temperature and low-pressure gas refrigerant at this point. Then, in the refrigerant heat exchanger 20c, heat is exchanged with the refrigerant that is about to flow into the refrigerant / water heat exchanger 20a, and it is superheated, returns to the heat source unit 1 through the refrigerant pipe 3b, and passes through an accumulator (not shown). Then, it is returned to the compressor 11.

  On the other hand, the cold / hot water circulating to the use-side heat exchanger 30 is cooled by the refrigerant to become cold water, and the circulation pump 37 is operated, whereby the cold / hot water pipes 25a of the refrigerant / water heat exchangers 20a, 20b, Out of 25b. And as shown by the arrow Y, it joins by the cold / hot water piping 43a, flows in into the utilization side heat exchanger 30 via the cold / hot water piping 4a, and cools the heat medium connected to the load which is not shown in figure. The cold / hot water heat-exchanged with the heat medium in the use side heat exchanger 30 is divided into the cold / hot water pipes 26a, 26b via the cold / hot water pipes 4b, 43b, and again, the refrigerant / water heat exchanger 20a, Cooled at 20b.

  However, at this time, if the circulating pump 37 is not operated due to a failure or the like, the cold / hot water may freeze and expand to destroy the refrigerant / water heat exchangers 20a and 20b. .

  For this reason, freezing prevention sensors t3 and t4 (temperature sensors) are provided in the vicinity of the cold / hot water outlets of the respective refrigerant / water heat exchangers 20a and 20b, and any of these freezing prevention sensors t3 and t4 is When it is detected that the temperature signal of the cold / hot water is equal to or lower than the first predetermined temperature Temp1, it is assumed that the cold / warm water flowing through one of the refrigerant / water heat exchangers 20a and 20b has a risk of freezing. The determination is made by the control device 24 and transmitted from the heat exchange side control device 24 to the heat source side control device 16 through a communication wiring (not shown), and the gas engine 10 of the heat source unit 1 is stopped. Here, it is desirable that the first predetermined temperature Temp1 is set to a temperature slightly higher than a temperature at which the cold / hot water starts to freeze.

  Further, as described above, since the refrigerant / water heat exchangers 20a and 20b are provided with the cold / hot water layer 33 in the outermost layers 36a and 36b, the temperature of the cold / hot water is accurately detected by the freeze prevention sensors t3 and t4. can do. As a result, there is no risk that the cold / hot water will be further cooled, so that freezing of the cold / hot water is avoided.

  Then, both the temperature signals detected by the freeze prevention sensors t3 and t4 are equal to or higher than the second predetermined temperature Temp2 higher than the first predetermined temperature, and at this time, the refrigeration apparatus 100 is operated by the remote controller (not shown). If the operation is instructed by, for example, the operation of the gas engine 10 is started again, and cold water is supplied from the heat exchange unit 2 to the use side heat exchanger 30. Here, the second predetermined temperature Temp2 is naturally not less than the first predetermined temperature Temp1, and it is desirable that the second predetermined temperature Temp2 be a minimum temperature without risk of freezing of the cold / hot water.

  In the refrigeration apparatus 100 of the present invention, as described above, the refrigerant outlet sensor T2 is provided on the refrigerant pipe in the vicinity of the second refrigerant outlet 54b, and the refrigerant inlet of the refrigerant / water heat exchanger 20a is provided. The refrigerant temperature signal detected by the refrigerant inlet sensor T1 provided on the refrigerant pipe in the vicinity of 34a and the refrigerant temperature signal detected by the refrigerant outlet temperature sensor T2 are selected to select the heat exchange side. By controlling the control device 24, without changing the software of the program stored in the heat exchange side control device 24, either the operation focusing on the ability of the refrigeration apparatus 100 or the operation focusing on energy saving The driving can be selected and performed.

  That is, by adopting the temperature signal of the refrigerant detected by the refrigerant inlet sensor T1, the heat exchange side control device 24 determines that the temperature of the refrigerant circulating in the heat exchange unit 2 is lower, An instruction is issued from the heat exchange side control device 24 to the heat source side control device 16 of the heat source unit 1 with a communication wiring (not shown) to reduce the operation capacity, and an operation with an emphasis on energy saving can be performed. By adopting the temperature signal of the refrigerant detected by the refrigerant outlet sensor T2, the heat exchange side control device 24 determines that the temperature of the refrigerant circulating in the heat exchange unit 2 is high, and heat exchange. The side control device 24 can instruct the heat source side control device 16 of the heat source unit 1 to operate with a sufficient operating capacity through communication wiring (not shown), and can perform an operation focusing on the capacity. Is shall.

  Switching between the refrigerant inlet sensor T1 and the refrigerant outlet sensor T2 is performed by providing a switch or the like in the heat exchange side control device 24 or the heat source side control device 16 and performing a switching operation of the switch or the like. Alternatively, the remote controller or the like may be provided with a selection switch, and the temperature signal detected by any one of the sensors T1 and T2 may be selected by operating the selection switch.

  A device that supplies cold water using a plate-type heat exchanger.

It is a figure explaining the system configuration | structure containing the refrigerant circuit of a freezing apparatus. It is an expanded view of a refrigerant | coolant / water heat exchanger. It is an expanded view of a refrigerant | coolant heat exchanger. It is the figure which showed the structure of the heat exchange unit. It is the figure which showed the connection of a receiver tank and a heat exchange side control apparatus. It is the figure which showed the circulation in the case of supplying cold water from a freezing apparatus, and cold / hot water.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat source unit 2 Heat exchange unit 3a, 3b Refrigerant piping 4a, 4b Cold / hot water piping 16 Heat source side control apparatus 20a, 20b Refrigerant / water heat exchanger 20c Refrigerant heat exchanger 21 Electric expansion valve 22 Receiver tank 23a, 23b Check valve 24 Heat exchange side control device 25a, 25b Chilled / hot water piping 26a, 26b Chilled / hot water piping 30 Usage side heat exchanger 40 Base frame 40a-40d Edge 43a, 43b Chilled / hot water piping 100 Refrigeration unit T1 Refrigerant inlet sensor T2 Refrigerant outlet sensor t1 , T2 Cold / hot water inlet sensor t3, t4 Freezing prevention sensor

Claims (5)

In a refrigeration apparatus configured by connecting a heat source unit that compresses and discharges a refrigerant, and a heat exchange unit that exchanges heat with the refrigerant and supplies cold / hot water to a use-side heat exchanger,
In the heat exchange unit, a refrigerant / water heat exchanger for exchanging heat between the refrigerant and the cold / hot water is provided as a divided plate heat exchanger, and the refrigerant supplied from the heat source unit and the A refrigerant heat exchanger for exchanging heat with the refrigerant returning to the heat source unit and a receiver tank for temporarily storing the refrigerant circulating in the heat exchange unit are provided, and these refrigerant / water heat exchanger, refrigerant heat exchanger A refrigeration apparatus, wherein receiver tanks are uniformly distributed in the heat exchange unit.   An even number of the refrigerant / water heat exchangers divided into a plurality are distributed and arranged in the heat exchange unit, and the refrigerant heat exchanger is arranged in the vicinity of one of the refrigerant / water heat exchangers. The refrigeration apparatus according to claim 1, wherein the receiver tank is disposed at a position facing the refrigerant heat exchanger with the center of the heat exchange unit as a center.   The plurality of refrigerant / water heat exchangers, the refrigerant heat exchanger, and the receiver tank are arranged in a substantially uniform manner near the edge in the heat exchange unit, and the refrigerant / water heat exchanger, The refrigerant inlet / outlet and cold / hot water inlet / outlet of each heat exchanger of the refrigerant heat exchanger are arranged in a direction facing the refrigerant inlet / outlet / cold water inlet / outlet of another heat exchanger. Refrigeration equipment.   The outermost layer in each refrigerant / water heat exchanger is a cold / hot water layer through which the cold / hot water flows, and flows out of the refrigerant / water heat exchanger in the vicinity of the cold / hot water outlet of the refrigerant / water heat exchanger. The refrigeration apparatus according to claim 1, further comprising a temperature sensor that detects a temperature of the cold / warm water to be performed. 5. The refrigeration apparatus according to claim 4, wherein the temperature sensor is provided by performing heat insulation treatment with outside air on an outer surface in the vicinity of the cold / hot water outlet of each refrigerant / water heat exchanger.

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